Disclaimer: I make no claim the holocaust did or didn't happen. But when you look at facts beyond the official narrative things get questionable. When you look at those same facts with the mindset that we've been hoodwinked for millennia, the official narrative gets questionable.
https://www.realhistorychan.com/holohoax-scholar-puts-foot-in-mouth.html
If you want to kill a lot of people, send them on a looong walk without food. Preferably at winter. It’s been done quite a few times. Why complicate things with gas chambers?
Typhus apparently is also effective, and quite likely the actual culprit of all the gas chamber killings.